Road construction and art of making same.



P. S. HUTGHINSON. ROAD CONSTRUCTION AND ART OF MAKING SAME.

APPLICATION FILED MAY 18, 1908.

Patented Apr. 13, 1909.

FRANK S. HUTCHINSON, OF FL U SH ING, NEW YORK.

ROAD GONSTRUGTION -AND ART OF MAKING'SAME.

Application filed kay 18,

To all whom it may concern:

Be it known that I, FRANK S. HUTcHiN- son, of Flushing, Queens county,New York, have invented a new and useful Improvement vin RoadConstruction and Art of Making Same, of which the following is a full,clear, and exact description.

My invention relates to improvements in the construction of highways,and the object of my invention is to produce a comparatively simple andinexpensive road which can'be laid without the use of expensivemachinery, and in which the fine materials of the road are sealed inwith the coarser parts so that a smooth permanent surfaceis formed.

Usually in road construction of the macadam or telford type, brokenstone of coarser and gradually finer sizes are laid in the road, rolled,the voids filled with the sand or finer crushed stone, the materialsbeing finer as they approach the surface. Sometimes the surface is alsoprovided with a binder of some sort, but generally the fine materialused to fill the voids between the coarser particles is not providedwith adhethe road is practically ruined; This is especially true inrecent years where so many fast automobiles are used, as these vehiclesmove with such rapidity that the suction caused has a tendency to drawup the finer materials of the road-bed, and so the road is rapidlyruined. Moreover, the tires of these heavy vehicles have a tendency tobreak up the surface, and once the surface is brokenthe finer parts oftheroad are quickly removed.

My inventioncontemplates the use of a binder, preferably of bituminousmaterials such as coal tar or as halt, and I use it in such a way as tostic together the whole body of the. road and form a seal over thecoarsera'parts, thus preventing the breaking up of thel road' and thesucking up of the finer particles. In carrying out this idea,'I providea layer oflbroken stone, preferably of a practically uniform, size, andfill the voids betweenthe stone with sand, gravel, or finely crushedrock. Over this I spread 'a quantity of 'ther bituminous binder above Wmentioned, and the fine materials in the Specification of LettersPatent.

Patented April 13, i909. 1908. serial No. 433,500.

,' voids absorb the binder and cause the-larger and smaller particles toclosely adhere. I I use more than suflicient binder to coverthe brokenstone and into the covering'of binder I roll the finer covering of theroad, which is preferably of crushed stone, and thus a complete roadwayis provided which is cheap, easily laid and durable, The details of thisstructure will be shown more clearly in the descri tion which follows.

Reference is to be had to the accompanying drawing forming a part ofthis specification. r

The figure is a broken cross section of a road-bed showing myimprovements.

The road-bed can be made with one, two, or more courses of broken stone.Where a single layer of the broken stone 10 is used,

particles are referably of a uniform size, and after the layer is placedin position the stone is preferably rolled heavily so as to settle asmuch as possible. Over this layer of broken stone I spread sand, gravel,or finely crushed rock, which is brushed or otherwise thoroughly workedinto the stone, and preferably so that none of the fine ma terial willappear above the stone surface, but rather should be just below thesurface. Over this stone I then spread my bituminous binder of coal tar,asphalt, or analo ous materials, and this is taken up by the er fillerform a homogeneous or compact bed. The binder'is put on in sufficientquantity to thoroughly saturate the surface of the filler and work up'above the stone tops so as to be absorbed by the covering of crushedrock or other fine material which forms the surface of the road, and isthoroughly rolled so as to be incorporated with the binder, and thus acomplete homogeneous mass is formed with the brokenstone and the fillerat the bottom, and the binder and covering at the top, and it will beseen that the mass is so thoroughly fastened together that swiftlyrunning vehicles-cannot possibly suck u the filler and that heav traflicwill not quickly disturb the parts. I the road is laid in more than onecourse, the broken stone or rock is placed at the bottom and rolled, asecond course of broken stone laid over this, and the filler applied tothe second course, after which the binder and covering are applied asclearly specified.

this is applied in the usual way, though thebetween the stones so thatthe stones and ios aware that the binder has been used in connectionwith a filler for the broken stone and in a way to be incorporated withthe covering as specified, whereby a practically uniform solid mass witha dense, fine, coherent covering is produced.

It will be seen that no expensive machinery is needed to lay this road,but that the ordinary crushed stone is used, and a roller is the onlyimplement needed to produce a perfect road-bed. v

Having thus fully described my invention,

I claim as new and desire to secure by Letters 15 Patent The hereindescribed improved roadway,

comprising a layer of broken stone, a fine FRANK S. HUTCHINSON.

Witnesses:

WARREN B. HUTCHINSON, WILLIAM S. DENIsoN. I

